<template>
  <div>
    <!-- 面包屑导航区 -->
    <Breadcrumb :List = "list"></Breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable = "false"
        show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class = "cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectCateKeys"
            :options="CateList"
            expand-trigger = 'hover'
            :props="cateProps"
            @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type = "primary" size="mini" :disabled = "isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <el-table :data = "manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type = "expand">
              <template slot-scope="scope">
                <el-tag v-for = "(item,i) in scope.row.attr_vals" :key = "i" closable @close = "handleClosed(i, scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type = "index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label = "操作">
              <template slot-scope="scope">
                <el-button type = "primary" icon = "el-icon-edit" size="mini" @click = "showeditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type = "danger" icon = "el-icon-delt" size="mini" @click = "removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type = "primary" size="mini" :disabled = "isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <el-table :data = "onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type = "expand">
              <template slot-scope="scope">
                <el-tag v-for = "(item,i) in scope.row.attr_vals" :key = "i" closable @close = "handleClosed(i, scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type = "index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label = "操作">
              <template slot-scope="scope">
                <el-button type = "primary" icon = "el-icon-edit" size="mini" @click = "showeditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type = "danger" icon = "el-icon-delt" size="mini" @click = "removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="30%"
      @close = "addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="30%"
      @close = "editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import Breadcrumb from '../Breadcrumb.vue'
export default {
  components: { Breadcrumb },
  data () {
    return {
      list: ['商品管理', '分类参数'],
      // 商品分类列表
      CateList: [],
      // 级联选择框双向绑定的数组
      selectCateKeys: [],
      // 被激活页签名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      addDialogVisible: false,
      editDialogVisible: false,
      editForm: {},
      // 控制按钮与文本框的切换形式
      inputVisible: false,
      // 文本框输入的内容
      inputValue: '',
      // 添加参数表单数据对象
      addForm: {
        attr_name: ''
      },
      // 级联选择框配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      this.CateList = res.data
    },
    // 获取动态参数和静态属性
    async getparamsData () {
      // 根据所选分类的id和当前所处的面板获取对应的数据
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        if (item.attr_vals !== '') {
          item.attr_vals = item.attr_vals.split(' ')
        } else {
          item.attr_vals = []
        }
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 点击按钮添加参数
    async addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getparamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showeditDialog (id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: {
          attr_sel: this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击按钮修改参数信息
    async editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getparamsData()
        this.editDialogVisible = false
      })
    },
    // 删除对应的参数
    async removeParams (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败！')
      }
      this.$message.success('删除成功！')
      this.getparamsData()
    },
    // 文本框失去焦点或摁下了enter都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      } else {
        // 如果没有return则证明输入内容需要后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 发起请求保存本次操作
        this.saveAttrVals(row)
      }
    },
    // 将attr_vals操作保存到数据库
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_vals: row.attr_vals.join(' '),
        attr_sel: row.attr_sel
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    },
    // 添加分类
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法的作用是当页面上元素被重新渲染之后才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClosed (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 关闭对话框事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 级联选择框选中项变化
    handleChange () {
      if (this.selectCateKeys.length !== 3) {
        // 选中的不是三级分类
        this.selectCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      this.getparamsData()
    },
    // tab页签点击事件处理
    handleTabClick () {
      if (this.selectCateKeys.length === 0) {
        return this.$message.error('请先选择商品分类')
      }
      this.getparamsData()
    }
  },
  computed: {
    // 如果按钮需要被禁用则返回true，否则返回false
    isBtnDisable () {
      if (this.selectCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
    cateId () {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width:120px;
}
</style>
